apachesolr 7.x-1.4

This fixes a number of bug fixes (and one small feature), some of which are continued fall-out from changes to the config files to adopt the "common" ones.

Changes since 7.x-1.3:

• #1807552 by pwolanin: further fixes to use the right language field.
• #2050747 by pwolanin: fix for Anonymous user names are not indexed correctly, empty facet value causes Solr error.
• #1565766 by j0rd: follow-up to not re-load the entity if it's passed in.
• #2032987 by rupertj: fix for entity_get_info() called but result never used.
• #1977832 by blazindrop: fix for Hidden fields in displays are still indexed.
• #1807552 by pwolanin: fix for regression: urls must be rendered at display time in search results.
• #1974076 by Nick_vh, pwolanin: Allow search pages to suppress the search form box on core search pages also.
• #1965210 by pwolanin: fix for More Like This blocks configuration page broken by Solr 3.x vs 4.x schema key positions.
• #1918434 by pwolanin, ajw: fix negative filter queries in validFilterValue()